How should the definition of tower punching be understood?
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When both the vapor and liquid load are too high, the pressure drop of the gas as it passes through the tray increases, which leads to an increase in the liquid level in the downcomer. As the liquid load increases, the liquid level at the outlet weir also rises; when the liquid fills the entire downcomer, the liquids on the upper and lower trays become connected, resulting in complete disruption of the distillation process and flooding of the tower. When both the vapor and liquid loads are too high, the pressure drop of the gas as it passes through the tray increases, which in turn causes the liquid level in the downcomer to rise. I’m not quite sure how to understand this; how can it be explained?
The vapor load is high; as it passes through the trays, the liquid phase flows to the outside of the trays and into the liquid collection tray or downcomer, resulting in an increase in liquid level. I’m not sure if I understand correctly.
This post was last edited by Refiner on 2016-3-21 at 16:40. An excessive vapor load caused the overall temperature of the distillation column to rise, resulting in heavier components moving upward and severe damage to the tray plates
When both the gas and liquid loads are too high, the pressure drop of the gas as it passes through the tray increases, which leads to an increase in the liquid level in the downcomer. A high liquid load already causes an increase in the liquid level in the downcomer; it also raises the liquid level on the tray and accelerates the flow of liquid toward the downcomer. When the gas load is high as well, the liquid passing over the float valves on the tray behaves as if it were about to boil, accelerating its flow over the tray weir and into the downcomer. In severe cases, this situation can cause the liquids on adjacent trays to merge together, resulting in a phenomenon known as tower flooding.
What is described above is the \"tower flooding\" phenomenon; when the tower is flooded, its pressure drop increases, and once it reaches a certain level, flooding occurs and the liquid phase is carried out from the top of the tower.
That is because too much vapor accumulates at the bottom, exceeding the pressure of the liquid phase above; as a result, it breaks through the liquid layer in a short time, carrying the heavier components to the upper trays and disrupting the distillation process. However, to understand tower flooding and tower flooding due to excessive liquid volume, it is essential to consider the relationship between gas-liquid phase equilibrium. When the gas load is greater than that of the liquid phase, tower flooding occurs over time; whereas when the liquid load is high, tower flooding due to excessive liquid volume takes place. Yet these two conditions can occur locally, leading to fluctuations in product quality. Therefore, we need to control the gas-liquid phase equilibrium to ensure stable production.
It is easy to understand that the liquid load here increases, resulting in higher levels of liquid on the trays and downcomers. As the gas-phase load increases, the amount of liquid mist carried in the gas phase gradually rises, resulting in a false liquid level. If the liquid-phase load also increases at the same time, the false liquid level will be even higher; if this is not addressed in a timely manner, the tower will be flooded